Dead pixel on Ipad air 5

Stuck or dead display pixels are unusual - but not unknown. There is an industry-wide scoring formula that is used to determine whether or not one or more pixels are considered to be a warranty defect.

Unfortunately, given the provenance of your iPad, you have very limited options...

If purchased directly from Apple, in most countries you have 14-days within which to unconditionally return your device for exchange or refund. Outside of this period, you are reliant upon the device warranty. Clearly you are outside of the 14-day returns period - and are not within the country of purchase (China).

In addition to the above, should you have opted to purchase the optional AppleCare+ cover prior to discovery of the problem, you may be have been able to make a claim. AppleCare+ plans are only valid within the country of purchase.

Due to international sanctions against the Russian Federation, Apple have completely withdrawn from Russia.

In conclusion, unless you can return the item to where it was purchased, you are very likely out of luck.

Apple's warranty should cover such screen defects, yes. But whether an iPad sold in China can be serviced in Kazakhstan is another issue. For many if not most issues, Apple will only provide service in the country in which the device was officially sold. This may particularly be true for a device sold in China where the government requires significant restrictions on manufacturers. You can try, but don't be surprised if warranty service in Kazakhstan is declined.

Good luck.

In addition to what VP said, adding on, some countries may not have the specific parts needed to service your device, However, service will be limited to the options available in the country where service is requested. 

-Zachyy ✌️